<!--父级页面:控制除了登录页面以外的所有页的共有左侧菜单栏与头部-->
<template >
<!--  给父元素使用弹性布局flex,可以让所有子元素横置且父元素不会失去高度-->
<div style="display: flex;">
<!--  {}代表先把{}里面的值算完再赋值给style进行属性绑定-->
  <div :style="{width:(isCollapse?'64px':'208px')}">
    <!--  左侧菜单栏 router的意思是允许跳转-->
    <el-menu
    background-color="#3C82F5"
    style="width:100%;height:100vh"
    text-color="#fff"
    active-text-color="#ff0"
    unique-opened
    router
    :collapse="isCollapse"
    :collapse-transition="false"
    @select="selectMenu"
    >
<!--      左侧菜单栏的顶部条-->
      <el-row style="padding-top: 10px">
         <el-col :span="2"></el-col>
         <el-col :span="7" style="padding-left:7px;">
           <el-avatar src="/imgs/admin/logo.png" style="width: 35px;height:35px"></el-avatar>
         </el-col>
         <el-col :span="isCollapse?0:13">
           <span style="color:#fff;position:relative;top:8px;left:2px;font-weight: bold">智慧车辆</span>
         </el-col>
      </el-row>

      <el-sub-menu index="1">
          <template #title>
            <el-icon style="font-size:21px;"><User/></el-icon>
            <span>用户管理</span>
          </template>
        <el-menu-item  index="/user">用户列表</el-menu-item>
      </el-sub-menu>

      <el-sub-menu index="2">
        <template #title>
          <el-icon style="font-size:21px;"><Van/></el-icon>
          <span>车辆管理</span>
        </template>
        <el-menu-item  index="/vehicle">车辆列表</el-menu-item>
      </el-sub-menu>



      <el-sub-menu index="3">
        <template #title>
          <el-icon style="font-size:21px;"><Location/></el-icon>
          <span>围栏管理</span>
        </template>
        <el-menu-item  index="/geofence">电子围栏</el-menu-item>
      </el-sub-menu>



      <el-sub-menu index="4">
        <template #title>
          <el-icon style="font-size:21px;"><Place/></el-icon>
          <span>调度管理</span>
        </template>
        <el-menu-item  index="/application">申请列表</el-menu-item>
        <el-menu-item  index="/audit">调度审核</el-menu-item>
        <el-menu-item  index="/distribute">车辆分配</el-menu-item>
      </el-sub-menu>



      <el-sub-menu index="5">
        <template #title>
          <el-icon style="font-size:21px;"><MessageBox/></el-icon>
          <span>数据字典</span>
        </template>
        <el-menu-item  index="/dict">字典管理</el-menu-item>
      </el-sub-menu>

    </el-menu>

  </div>

  <div :style="{width:(isCollapse?'calc(100% - 64px)':'calc(100% - 208px)')}">
<!--    右侧:顶部条-->
    <el-header style="padding-top:22px;height: 10vh;background-color: #fff;">
      <el-row :gutter="10">
        <el-col :span="18">
          <el-icon style="font-size:20px" @click="changeCollapsed"><Expand/></el-icon>
        </el-col>
        <el-col :span="6" style="position: relative">
            <el-dropdown  trigger="click" style="position:absolute;right:20px">
    <span style="font-size:19px;font-weight:bold;">
      {{user.username}}
      <el-icon ><arrow-down /></el-icon>
    </span>
              <template #dropdown>
                <el-dropdown-menu>
                  <el-dropdown-item @click="logout">退出登录</el-dropdown-item>
                </el-dropdown-menu>
              </template>
            </el-dropdown>
        </el-col>
      </el-row>
<!--      面包屑导航-->
      <el-breadcrumb separator="/" style="position: relative;top: 20px;">
         <el-breadcrumb-item>首页</el-breadcrumb-item>
        <el-breadcrumb-item v-for="item in breadcrumb">{{item}}</el-breadcrumb-item>
<!--         <el-breadcrumb-item>用户管理</el-breadcrumb-item>-->
<!--         <el-breadcrumb-item>用户列表</el-breadcrumb-item>-->
      </el-breadcrumb>

    </el-header>
<!--    右侧:主体内容（可变区域）-->
    <el-main style="height:90vh;padding:0;overflow-y: auto;">
      <router-view/>
    </el-main>


  </div>



</div>

</template>

<script setup>

import {ref} from "vue";
//定义变量控制左侧菜单栏是否折叠 true是折叠， false是不折叠
const isCollapse =ref(false);

const user = ref(getUser());
const changeCollapsed = () =>{
  isCollapse.value=!isCollapse.value;
}
//定义退出登录的方法
const logout =()=>{
  if(confirm('您确定要退出登录吗？')) {
    localStorage.removeItem('user');
    localStorage.removeItem('breadCrumb');
    //退出后跳转至登录页
    window.location.href = '/login';
    //也需要把已经取出来的user对象清空

    user.value = '';
  }
}
// 必须先转回成对象，因为字符串无法遍历  上面还要遍历breadcrumb呢！
const breadcrumb = ref(JSON.parse(localStorage.getItem('breadCrumb'))||['用户管理','用户列表']);
let map = {
  '/user':['用户管理','用户列表'],
  '/vehicle':['车辆管理','基本信息'],
  '/geofence':['电子围栏','围栏管理'],
  '/application':['调度管理','申请列表'],
  '/audit':['调度管理','调度审核'],
  '/distribute':['调度管理','车辆分配'],
  '/dict':['数据字典','字典管理']
}
//定义选择菜单项触发的方法  map[index]相当于map.get(index)
const selectMenu = (index)=>{
 breadcrumb.value=map[index];
//  把面包屑存到localStorage中  这样就不会丢失了  难道存到localStorage中都必须以字符串形式存吗？
//   breadcrumb.value 是数组 不是字符串
    localStorage.setItem('breadCrumb',JSON.stringify(breadcrumb.value))
}

</script>